Aeroplane propeller and governor



Aug. 19, 1930. H. M. PEREZ AEROPLANE PRDPELLER AND GOVERNOR Filed Jan. 26, 1929 lain/Xenia 1 Patented Aug. 19, 1930 HAIM M. PEREZ, OF NEWPORT BEACH, CALIFORNIA AEROIPLANE PROPELLER AND GOVERNOR Application filed January 26, 1929. Serial No. 335,327.

My invention is an aeroplane propeller and governor.

An object of my invention as concerns the propeller is to utilize weighted tips on the propeller to give a more steady motion of rotation and to do this I preferably utilize a hollow metal propeller structure with a weighted metal cast in the tips. This weight giving metal should be sufiiciently hard so that under the action of centrifugal force there will be no danger of it flowing.

The governor comprises a centrifugal type of governor on the propeller shaft, having Weights secured to arms "pivotally connected to the shaft which are thrown outwardly as the speed of the shaft and propeller increases and in which a spring is compressed asthe balls are thrown outwardly. By this action the governor type of device acts on the-propeller shaft.

My invention is illustrated in the accompanying drawings, in which;

Figure 1 is a side elevation partly broken away of an aeroplane, showing the installation of my invention;

Fig. 2 is a side elevation showing the mounting of the governor on the propeller shaft, indicating the position of the governor at slow speeds;

Fig. 3 is a viewsimilar to Fig. 2, showing the position of the governor at high speeds.

Iii/the drawings, a fuselage of the aeroplane is designated by the numeral 11. "This has forward and rearward cross braces 12 and 13, the propeller shaft 14 having journals 15 and 16 in the cross braces 12 and 13 respectively. The forward journal 15 is illustrated as of the roller type functioning-in part as a-thrust bearing. Thepropeller 17 is mounted on' the forward end of the shaft and the motor 18 drives the propeller shaft through the motor shaft 19 and a flexible coupling20.

Referring to the propeller construction, this may have blades of any suitable character, but are preferably made of metal and have a hollow section 21. The tips have a Weight giving metal 22 cast therein. This metal may be'cast in position by drilling holes in the end of the hollow propeller and castin g a weight giving metal therein. The metal 5 at the holes is then smoothed oif to conform to the contour of the blade. The metal case in the tips should be sufficiently hard to prevent flow under the action of centrifugal force. v

The governor type of device utilizes a sleeve 23 which is illustrated as being secured to the propeller shaft 14 by a pin 24 and on this sleeve there are pivotally mounted a plurality of weight carrying arms 25. These arms have weights 26 at their outer ends. A slidable sleeve 27 is mounted on the propeller shaft and has a collar 28 and an annular recess in which is fitted a collar 29. This collar has short radial arms 30 connected thereto and links 31 are pivotally connected between the outer ends of the arms 30 and the weight carrying arms 25.

A cage 32 formed of two rings 33 and 34 connected by bars 35, are fitted on the propeller shaft over the sleeve 23 and this-cage is free to slide longitudinally. A heavy compression spring 36 is carried between the ring 33 of the cage and the flange 37 on a collar 38 which abuts against the bearing 39. A sec- 0nd spring 40 abuts against the ring 34 of the cage and the flange 41 of the collar 28.

In action the weights on the outer end of the propeller cause this to have a more steady motion having a type of fly wheel effect and the speed of rotation is not influenced to such a great extent by slight fluctuations in the power of the engine or by the action. of wind as a propeller having light tips at the extremities. Therefore by my construction the s5 propeller has a more even motion in the air than propellers of the ordinary type.

The action of the governor at low engine speeds is to rotate with the weights close into the shaft, these being maintained in this position by the springs. At higher engine speeds and speeds of the propeller, the weights are thrown outwardly, compressing the springs 40 and 36. The cage 32 allows the two springs to work together, the spring 40 preferably being lighter than the spring 36 so that the pressure is transmitted from thrust bearing, links between the first collar and the said arms, the said arms being thrown outwardly on rotation of the shaft and compressing the first spring,-and the said first spring thrusting the cage longitudinally of the shaft and-compressing the second spring to transmit pressure to the thrust bearing and the spring 40 through the cage to. the spring ,retard the rotation of the shaft.

36 and from, the spring 36 to the collar 38 and hence to the forward journal 15. The governor responds to fluctuations in engine speed or changes of propeller speed due to running into air of varying density and tends to give a more steady speed of rotation to the propeller shaft and to the propeller.

Various changes may be made in the principles of my invention without departing from the spirit thereof as set forth in the description, drawings and claims.

I claim:

1.'In a device as described, an aeroplane fixed structure having a propeller shaft journaled therein, a propeller driven by the shaft, the shaft having a thrust bearing in the structure, a plurality of weighted arms pivotally connected to the shaft to rotate therewith, a collar slidable on the shaft and having a link connected to each of the arms, a first spring bearing against the collar and against a cage, the cage surrounding the pivotal connection of the arms to the shaft, a second spring bearing against the cage and having means to transmit pressure to thethrust bearing, said springs becoming compressed on the outward throw of the arms due to the rotation of the shaft.

2. A device as described, comprising in combination a fixed structure of an aeroplane having a propeller shaft journaled therein, the shaft driving a propeller and being operated by an engine, a thrust bearing in one of the structures, a plurality of weighted arms pivotally connected to the shaft to rotate therewith, a first collar on the shaft adjacent the said bearing, a cage surrounding the shaft and the pivotal connection of the said arms, a second collar slidable on the shaft and having a link connected to each of the arms, a first spring between the first collar and the cage, a. second spring between the cage and the second collar, the said springs becoming compressed on the outward throw of the arms due to rotation of the shaft. 3. A device as described, comprising in combination a fixed structure of an aeroplane having a propeller shaft journaled therein, the shaft driving a propeller and being operated by an engine, a thrust bearing in one of the structures, a plurality of weighted arms pivotally connected to the shaft to ro tate therewith, a first slidable collar on the shaft, a slidable cage on the shaft surrounding the pivotal connection of the arms, a first spring between the collar and the ca e, a second spring between the cage and t e In testimony whereof I have signed my name to this specification.

' HAIIMI M. PEREZ. 

